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Behav Brain Res. 2016 May 15;305:265-77. doi: 10.1016/j.bbr.2016.03.023. Epub 2016 Mar 10.

Autophagy ameliorates cognitive impairment through activation of PVT1 and apoptosis in diabetes mice.

Author information

1
College of Medicine, State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Animal Models and Degenerative Neurological Diseases, Nankai University, Tianjin 300071, China.
2
College of Medicine, State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Animal Models and Degenerative Neurological Diseases, Nankai University, Tianjin 300071, China. Electronic address: zhuoyang@nankai.edu.cn.

Abstract

The underlying mechanisms of cognitive impairment in diabetes remain incompletely characterized. Here we show that the autophagic inhibition by 3-methyladenine (3-MA) aggravates cognitive impairment in streptozotocin-induced diabetic mice, including exacerbation of anxiety-like behaviors and aggravation in spatial learning and memory, especially the spatial reversal memory. Further neuronal function identification confirmed that both long term potentiation (LTP) and depotentiation (DPT) were exacerbated by autophagic inhibition in diabetic mice, which indicating impairment of synaptic plasticity. However, no significant change of pair-pulse facilitation (PPF) was recorded in diabetic mice with autophagic suppression compared with the diabetic mice, which indicated that presynaptic function was not affected by autophagic inhibition in diabetes. Subsequent hippocampal neuronal cell death analysis showed that the apoptotic cell death, but not the regulated necrosis, significantly increased in autophagic suppression of diabetic mice. Finally, molecular mechanism that may lead to cell death was identified. The long non-coding RNA PVT1 (plasmacytoma variant translocation 1) expression was analyzed, and data revealed that PVT1 was decreased significantly by 3-MA in diabetes. These findings show that PVT1-mediated autophagy may protect hippocampal neurons from impairment of synaptic plasticity and apoptosis, and then ameliorates cognitive impairment in diabetes. These intriguing findings will help pave the way for exciting functional studies of autophagy in cognitive impairment and diabetes that may alter the existing paradigms.

KEYWORDS:

Apoptosis; Autophagy; Cognitive impairment; Diabetes; Hippocampus; Long noncoding RNA; PVT1; Regulated necrosis; Synaptic plasticity

PMID:
26971628
DOI:
10.1016/j.bbr.2016.03.023
[Indexed for MEDLINE]

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